只允许使用名称并且强制采用大写形式。
允许使用字母、空格和 '（撇号）。位于空格后的字符自动采用大写形式。不位于空格后的字符自动采用小写形式。位于撇号后的字符可以采用大写形式也可以采用小写形式。字符串中只允许有一个撇号。一行中不得有一个以上空格。
由于采用 .Net 中的 Char.Isletter 方法实现，因此被归类为 Unicode 字母的字符将被视为字母。
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